High-frequency coupler and communication device

• US 8,400,231 B2
• Filed: 05/03/2012
• Issued: 03/19/2013
• Est. Priority Date: 12/15/2008
• Status: Active Grant

• Current Assignee: Murata Manufacturing Co Limited
• Original Assignee: Murata Manufacturing Co Limited
• Inventors: Kato, Noboru, Sasaki, Jun, Miura, Teppei
• Primary Examiner(s): Takaoka, Dean O
• Application Number:
  US13/462,841
• Publication Number:
  US 20120218071A1
• Time in Patent Office: 320 Days
• Field of Search: 333/24.R, 343/802, 343/816, 343/818, 343/819, 343/700.MS
• US Class Current: 333/24.R
• CPC Class Codes: H01Q 1/38 formed by a conductive layer on an insulating support patch antennas H01Q9/0407; microstrip dipole antennas H01Q9/065; microstrip slot antennas H01Q13/106; transmission line microstrip antennas H01Q13/206; manufacturing reflecting surfaces using insulating material for supporting the reflecting surface H01Q15/142
• CPC Class Codes: H01Q 19/10 using reflecting surfaces
• CPC Class Codes: H01Q 7/00 Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
• CPC Class Codes: H01Q 9/16 with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole H01Q9/44 takes precedence
• CPC Class Codes: H01Q 9/27 Spiral antennas

Abstract

A high-frequency coupler and a communication device are compact, capable of efficiently communicating a large volume of data over a short distance and can be used in combination with a non-contact IC card. The high-frequency coupler includes magnetic-field-generating patterns and a surrounding pattern disposed around a periphery thereof, and is used to communicate a large volume of data over a short distance in a communication system that uses broadband frequencies. Out of the magnetic fields radiated in directions perpendicular or substantially perpendicular to the plane of the patterns from the magnetic-field-generating patterns, portions extending laterally in the plane of the patterns are blocked by the surrounding pattern, the magnetic fields are lengthened in a direction perpendicular or substantially perpendicular to the plane of the patterns and the communication distance is increased.

Claims

1. A high-frequency coupler comprising:

a magnetic-field-generating conductive pattern that generates a magnetic field; and

a folded conductive pattern which includes a first line portion, a folded back portion, and a second line portion, and is arranged close to the magnetic-field-generating conductive pattern, wherein

the first and second line portions are arranged next to and in parallel with each other, and

an electric current flowing through the first line portion and an electric current flowing through the second line portion flow in opposite directions.

2. The high-frequency coupler according to claim 1, wherein the first and second line patterns are arranged parallel to the magnetic-field-generating conductive pattern.

3. The high-frequency coupler according to claim 1, wherein the folded conductive pattern includes a plurality of the folded back portions.

4. The high-frequency coupler according to claim 1, wherein the folded conductive pattern functions as an electric-field antenna.

5. The high-frequency coupler according to claim 1, wherein the magnetic-field-generating conductive pattern and the folded conductive pattern are connected to a communication circuit unit.

6. The high-frequency coupler according to claim 1, wherein a length of the folded conductive pattern is substantially equal to an integer multiple of λ

/2, where λ

is a predetermined frequency.

7. The high-frequency coupler according to claim 1, wherein a magnetic member is provided on one side in a direction in which the magnetic field is generated by the magnetic-field-generating conductive pattern.

8. The high-frequency coupler according to claim 1, wherein a communication signal is a high-frequency signal of 1 GHz or higher.

9. The high-frequency coupler according to claim 1, further comprising:

a magnetic-field antenna pattern;

wherein

the magnetic-field-generating conductive pattern and the folded conductive pattern are arranged inside the magnetic-field antenna pattern.